Introduction to Cai Lun: Cai Lun (61-121), courtesy name Jingzhong, was the innovator of papermaking among the four great inventions of ancient China. When he was 12 years old, he entered the palace and served as an eunuch. In 105, he transformed the papermaking technology and pressed bark, fishnets and bamboo into paper. This also completely rewritten the history of later generations of China and the world, making Cai Lun one of the outstanding figures in ancient and modern times, both at home and abroad. List.